Polygon shape from PhysicsEditor not quite correct

We are converting one of our games from iOS to WP7, where on iOS we used Box2D as our physics engine. Translation went very smooth, including physics side using Farseer physics. We are using a tool called physics editor (http://www.physicseditor.de/)
to create polygon shapes from our sprites. On iOS world, they provide a class to create fixtures from the exported data and it works really great. In WP7 side, we created our own class which reads the exported data form that app which applies it to a body.
The result we got is merely good but we also see that, visually, collisions happen although they shouldn't.

We wanted to ask whether somebody had any perfect success using that tool and exported data in Farseer physics? We also see that Farseer has a built-in texture to polygon converter, is it worth to try it?